Pneumatic or hydraulic vise



Mlmh 1 c. J. LINDEGREN PNEUMATIC OR HYDRAULIC VISE Filed Dec. 30, 1940 Fig 7 Ell Patented Mar. 28, 1944 UNITED. STATES PATENT "OFFICE" 2,345,401 PNEUMATIC on HYDRAULIC VISE Carl J. Lindegren, Worcester, Mass. Application December 30,1940, Serial No. 372,397

1 Claim.

This invention relates to a fiuid pressure operated vise and it is an object of the same to provide a vise of this character which shall be of simple and rugged construction, as compared with fluid pressure operated vises as heretofore constructed. Such a vise may be operated by the use of a suitable gas, such as compressed air, or by a suitable liquid such as water.

Another object of the invention is to provide a device of this character with adjusting means of simple and conveniently operated character whereby the tool can readily be accommodated to work of a considerable variety of sizes. It has been a drawback in hydraulic vises with which I am acquainted that because of the constant stroke of the piston they are not well adapted to work of various sizes but are quite limited in the scope of their usefulness.

Another object of the invention is to provide a device having adjusting means for changing the range of movement of the movable j aw, which adjusting means is conveniently located at a point in front of the work.

Other objects and advantages of the invention will appear from a consideration of the following description and of the drawing, which is made a part of this application and in which similar.

reference characters indicate similar parts.

Referring to the drawing:

Fig. l is a vertical longitudinal section of the device of my invention;

Fig. 2, a section along line 2--2 of Figure 1;

Fig. 3 is a front view; and

Fig. 4, a side elevation,

In the drawing, wherein is shown an embodiment of that form of the invention at present considered preferable reference character ID indicates generally the fixed rear jaw of the device, which is secured to a suitable support II, as by means of ears l2 with apertures to receive screws or bolts for holding the vise in place. Integral with the fixed rear jaw is the front wall I3 of a chamber for a piston 14 and the circumferential wall I5 is also integral with said jaw. The chamber is shown as being cylindrical but it is obvious that it may be of any desired shape. The piston chamber is closed at its rear end by a removable plate l6 held in place by screws IT.

The piston I4 is secured in any desirable manner to a drawbar 18 passing through a gland IS in the front wall l3 of the piston chamber and provided with suitable packing to prevent loss of fluid from the chamber. The drawbar i8 is threaded at its forward end for engagement end nut 20 has an annular groove at 2| for engagement by a saddle 22, here shown as pivotally supported by a screw 23 on the front jaw 24 of the vise, whereby convenient means is provided for assembling the parts.

The movable jaw has integral therewith an elongated sleeve 25 fitting in a bore on the fixed jaw, said sleeve being slidable in a guide portion 26 of the fixed jaw which guide extends forward beyond a plane passing through the meeting line of the gripping portions 21 and 28 of the respective jaws, while the sleeve 25 extends back substantially beyond said plane, so as to afford simple and positive supporting means for the movable jaw and simple and direct coaction of the parts. It will be noted in Figs. 1 and 3 that the guiding portion 26 is cut away at its forward end to provide a space for receiving the reduced neck 29 of the movable jaw. The sleeve 25 is provided at opposite sides with slots at 30 to receive slide blocks 3| mounted on pins 32 on the guide portion 26, whereby any rotative movement of the movable jaw tending to misaline the gripping surfaces 2'! and 28 is prevented.

At either end of the piston chamber there are ports for admission of fluid from pipes 33, 34 for moving the piston respectively forward and backward. Fluid of suitable character is admitted to the pipe 34 from a suitable source of fluid pressure while simultaneously the fluid in the rear of the piston chamber is permitted to escape through pipe 33, and vice versa, by means of any suitable valve arrangement such as a multiple path valve in a casing 35, the details of which valve are not shown as such details do not form any part of my invention, such valves being Well known in the arts. The valve structure is operated by a pedal 36 which is also located at the front of the device, i. e., in front of the work which is held in the vise, and preferably approximately directly underneath the vise, so that a workman may operate the pedal while in position to operate on the work held in the vise.

It will be evident from the foregoing that, while the stroke of the piston is constant, the front jaw can be so adjusted as to accommodate a substantial variety of sizes of work and that such adjustment can be made with great facility.

It will also be evident that in the preferred construction, wherein the piston chamber is made a part of the fixed jaw, the weight of such parts is added to the weight of the jaw and the strength and rigidity of parts will be materially increased with threads of an adjusting nut 20. At its rear While at the same time the tool is made very compact. It is also a matter of great convenience to locate the adjusting means at the front of the tool at a distance from the work, so that adjustment can be made without the necessity of the workman leaving his normal Working position and without interference by the work.

It will be obvious to those skilled in the art that many changes may be made in the device of my invention as herein disclosed, provided they come within the scope of the claim of this patent.

What I claim is:

In a fluid pressure operated vise, a fixed rear jaw, a movable front jaw, fluid pressure opersaid piston to said movable jaw, said bar having 20 its outer end threaded, said threaded and extending through and beyond said movable jaw, means for adjusting the movable jaw along said draw bar to vary the range of movement of said movable jaw, said means including a nut at the front side of said movable jaw in threaded engagement with the protruding end of said draw bar, said nut and movable jaw having cooperating means for holding said jaw and nut together, said vise having an integral rearwardly extending sleeve on the lower part of said front jaw, said sleeve having longitudinal slots at opposite sides thereof, slide blocks in said slots, the fixed rear jaw having guiding means surrounding said sleeve and extending forwardly at least to the plane of meeting of the gripping edges of said jaws, and pins on said guiding means said pins extending into openings in said slide blocks.

CARL J. LINDEGREN. 

